/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.shardingsphere.sql.parser.relation.metadata;

import lombok.Getter;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

/**
 * Relation meta data.
 */
@Getter
public final class RelationMetaData {
    
    private final List<String> columnNames;
    
    public RelationMetaData(final Collection<String> columnNames) {
        this.columnNames = getColumnNames(columnNames);
    }
    
    private List<String> getColumnNames(final Collection<String> originalColumnNames) {
        List<String> result = new ArrayList<>(originalColumnNames.size());
        for (String each : originalColumnNames) {
            result.add(each.toLowerCase());
        }
        return result;
    }
}
